Way to serious and hard for the street, as you know.
I would try to soften the shocks via the adjustments but i really doubt it will soften it enough for you. That kits is deisgned for pure race cars. It could be possible for us to revalve the shocks and change the spring rates. I would have to have a look at the units you have though.
However, having said that, cost vs result may not be favourable if you know what i mean.
What Tein coilovers do you have now that are not height adjustable? Or do you mean you cant get it low enough for your liking?